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Thu, 15 Oct 2026 10:39:44 -0400 (EDT) Date: Thu, 15 Oct 2026 15:39:43 +0100 From: Kiryl Shutsemau To: "Vlastimil Babka (SUSE)" Cc: Johannes Weiner , Andrew Morton , David Hildenbrand , Harry Yoo , Usama Arif , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Zi Yan , Shakeel Butt , linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH v3] mm: page_alloc: make defrag_mode retries follow the promoted order Message-ID: References: <20261009125503.126202-1-kas@kernel.org> <15a9e03e-c748-4e51-b8cc-583a3610c897@kernel.org> <20261012192834.6934ef85444dee4a60d6d876@linux-foundation.org> <20261014202936.GC371161@cmpxchg.org> <78238103-3a7f-432c-b1df-bd14d7cf4bb1@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 35FD840002 X-Rspam-User: X-Stat-Signature: 6ofqpf6n93wnc83k15jgs8t4kh3oq13p X-HE-Tag: 1792075191-421266 X-HE-Meta: U2FsdGVkX19BKNeG5OAjOkofL6KOraLZAJ+3bs7KjI+giGQwCNz39txqVPY5cPDoM1eFXxXgeQVZi3loz/DXVx3Xc96edUoQsLCN2y/CyOHoHMNBE3seCs+NzXU+1WviXlMbeEEDbRVa8P96Km3hVcV237awpRHRT6GphJG2MxBewZz5c0Csj7AcO4OIWfu3VXEO0U/tjls4bjc5GnApAIxhR6IBx/t82Ru3cCzGycH+WmWjtxTLzxOymDH2wL9Snv25hbgILRcH0ZJ/6Bx0OVLFjd1hPOBFXlkY8asLz3x3KDstFe8pgHhKvcRXwo0p9gCjjS1oca71Dgn90lld7d9xyarnSN6OiNl/QnM78T2/dWeZSFQmj8VU+xoKpaJribylqz7bvmxwZ9SrTq4ldrsvhzTLjJMxw7gvwRR5jFzjzMkDhXQQRzwatzJ4PZR9XvkwkZzCGxMl66QDYGwt8anx37gRA0zvaE8BbV0Ou/rORm4lM3l1viLoUZyZXNjC4p98kxhe3e7G53mLiPO/JT2rrnT6t6LGBAtUEsfWGm3qW6d8imIy1ncezoN5UcTcknauuG0lxUnBxp54YFd3fMgbgZxALcW2Iv9RtgKGihRFFuYjPEa3y7YlD1wMnDro2awNx9ZMz9XFRTikcfOPTr+JLnXgIemY96V+Q6BNx0FFiow991ghUBl28WGHVfb4JmPGsNPax3ID4rp/PxQo9VM25XRYxu0DKHKm1lAIaAuMr4Nrxsn3FV8xcj3806APcA9TQoyYcc/nNQx/VRQY22Sw/jP9pTkUkw6QPNqkDzI8GxScZ8ZhWhFDDlxdexHqdWE0izSnhXExWhUnnE49aYjKBDaqicLs9lz2g+YSeesEsUr91oqubp7aCr6i2Ik6jvREZ8gAcC6xO5NnRFC/fPZhLj76niEYIzwFYxJdTIQ2k1EQ7NlYSymYTJ8UjvKDGG8aL6jPbrKQqwszroH tDIDW9iF 8LHCSzXQ2DmK87cUNhw/N1x68h5ZD3d4oXjrKA7oLdVD91xQ5qvYBsymgNNRbiVHFmdbvTov9VKj31+AUTGs1ALNr5EI52mg5F5sqbIkAbfb1EKDtGMyEUPCakXSZY0uqqs2j9fs5Dwv6UDSvOTQ2b5304vSkSGar6AaSdDwBWvOZTWEcmdoEZc6LwC/Nm4Fy7nhK6nRseFycZiF2jqU1FohjPVmhrteZP5dZm25JdP9vn2KZ6eGaMybcn/lsCDrAuJ7WL8cwQ9Ec3q4OyIbekmZ9/Oh7xBD/foOXOVF3BJMKTdwhIvhg7mDtCZWWga5XOMz4Rcwqj7QnjFQ= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Oct 15, 2026 at 03:53:30PM +0200, Vlastimil Babka (SUSE) wrote: > On 10/15/26 14:55, Kiryl Shutsemau wrote: > > On Thu, Oct 15, 2026 at 09:16:36AM +0200, Vlastimil Babka (SUSE) wrote: > >> > And agree 7.4-rc1 with CC stable is fine. Sadly, not sure if anyone > >> > but Meta is using the feature right now. > >> > >> I thought it was there for a long time but it was only added in 2025 :) At > >> least the enterprise world is slow to adopt things, AFAICS. > > > > I was thinking to propose a patch after merge window to make defrag_mode > > default. Do you think it is too early? I don't think it is ever going > > to be truly stabilized without wider exposure. > > We can try it, but preferably with arguments (and best, numbers). Will do. > > We also discussed with Johannes to make a stricter (defrag_mode=2?) mode > > that will not give up on fragmentation ever, but OOM instead. > > Would you use that mode at Meta? That however most likely wouldn't be > general purpose enough to become default. Yes, we consider it to be preferable to fragmentation. But it requires experimentation. -- Kiryl Shutsemau / Kirill A. Shutemov